1 . 已知随机变量
的分布列为
则随机变量
的数学期望![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a410f3a274456b579cc10d8a32ee012c.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | -1 | 0 | 1 | 2 |
![]() | 0.1 | 0.2 | 0.3 | 0.4 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e96ebf0722027eae62ff434667bca69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a410f3a274456b579cc10d8a32ee012c.png)
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2023-04-20更新
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342次组卷
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2卷引用:山西省2022-2023学年高二下学期期中数学试题